Pulley-block carrier



Why 22, 192 3.

T. F. WEBSTER PULLEY BLOGK- CARRIER Filed.Nov. 18; 1919? 2 .Shegts-Sheet l 216 Haw fm m) May 22, 1923.

T. -F. WEBSTER PULLEY BLOCK CARRIER Filed Nov) 1 2 Sheec-Sheet 2 Patented May 22, 1923.

THOMAS F. WEBSTER. OF PHILADELPHIA, PENNSYLVANIA.

PULLEY-BLOCK CARRIER.

Application filed November 18, 1919. Serial No. 338,935.

T 0 all "whom it may concern.

Be it known that I, Tnonas F. 'Wrsnsrnn, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented.

certain Improvements in Pulley-Block Carriers, of which the following is a specification.

My invention relates to improvements in the sheave or carrier of a scraping apparatus used in storingcoal. or other material, in which a rope carrying a scraping device is moved first in one direction and then in the opposite direction and when the direction of movement is reversed a certain slack occurs.

The object of my invention is to provide means for balancing the sheave carrier, so that. the sheave will be held in the proper position at all times irrespective of the tension on the rope.

\Vhile my invention is particularly adapted for use in connection with scraping apparatus for scraping coal, or'other granular material on the surface of a pile, it will be understood that it can be used in other places without departing from the essential features of the invention.

In the accompanying drawings:

Fig. l is a side view of my improved balance sheave carrier;

Fig. 2 is a plan View of the sheave;

Fig. 3 is a view drawn to a reduced scale showing the sheave carrier attached to the back chain of a scrapingapparatus; and F 4 and 5 are views illustrating details of the invention.

Referring to Fig. 3, 1, 1 are fixed posts. 2 is a chain extending from one post to another. 3 are rings in the chain spaced a given distance apart. 4 is a sheave carrier in the fornrof a lever pivoted at 19. On one arm of the carrier is a sheave 6 and on the other arm is a balance weight 17. A

rope 0- passes around the sheave 6, as shown in Fig. 3, and when the rope is taut the chain is rigid and the sheave is held in proper position. hen the rope is slack, then the tension on the chains is reduced and the pivot pin can move downwards, but the sheave carrier will remain in such a position as to hold the sheave horizontal, owing to the balance weight 17.

In the present instance, the carrier is constructed as follows: 14 are two plates spaced apart to receive a link 21 connecting the pivot pin with the ring 20 to which the chains 22 are attached. These chains are secured to two of the rings 3 of the chain 2, as shown in Fig. 3. Secured to the two plates 14 is a bar 16, preferably shaped as shown in Fig. 1, and on the bar is a counter weight 17. Extending between and secured to the two plates 14, at the end of the carrier opposite the weight, is the shank 13 of a swivel pin-11, having a head 12. On this swivel pin is a swivel bloclz 9, having arms 10 to which are attached the two side members 5 by pins 8. The pivot pin 7 on which the sheave 6 is mounted extends through bearings in these side members, as shown. The members 5 are shaped to form guards for the rope (1 One of the side members has a projection 18 extending in front of the head 12 of the swivel pin 11.

It will be seen by the above construction that where the sheave is used as the back sheave. or block, of a scraping apparatus for removing or piling coal, or other material, or when the direction of movement of the rope is reversed, there is a certain amount of slack and if the sheave were not balanced it would be dropped to such an angle as would cause the rope to rub on the fixed portions of the block. By having the block balanced, the sheave is always held in substantially horizontal position.

I claim: The combination in a balanced rope sheave, of a carrier having two arms; a

sheave mounted at one end of one'arm and a counterweight on the other arm; a flexible support flexibly attached to the carrier at a single point substantially midway between the sheave and the counterweight so as to hold the sheave in a horizontal position, the flexible support'consisting of two' flexible members extending at an angle in respect to the longitudinal line through the carrier and attached to a support some distance from the carrier.

THOMAS F. \VEBSTER' 

